Chū-Bra!! (ちゅーぶら!!, Chū Bura!!) is a Japanese manga series written and illustrated by Japanese manga author Yumi Nakata. The manga was first serialized in the Japanese seinen manga magazine Comic High! on January 22, 2007, and is published by Futabasha. An anime adaptation began airing on January 4, 2010 in Japan. The anime is also being streamed with English subtitles on the Crunchyroll online video service in North America, Australia, New Zealand and the United Kingdom.
The story centers on Nayu, a middle school girl who shocks her schoolmates on the first day of school by wearing black lace panties. She likes this kind of underwear, and she tries to "spread the word on the merits of [these kinds of] underwear" via an underwear club with her schoolmates, who are worried about their bodies' development and which underwear to choose.